Evidence of Time Symmetry Violation in the Interaction of Nuclear Particles

Measurements of the proton polarization in the reactions /sup 7/Li(/sup 3/He,p/sub pol/)/sup 9/Be and /sup 9/Be(/sup 3/He,p/sub pol/)/sup 11/B and of the analyzing powers of the inverse reactions, initiated by polarized protons at the same c.m. energies, show significant differences which imply the failure of the polarization--analyzing-power theorem and, prima facie, of time-reversal invariance in these reactions.